But if, actually, it has varying density maybe because it is some metallic thing with various metals or with varying thickness or something then you can still get the mass by integrating the density.

但如果，密度可能是变化的，因为它是许多金属的混合物，或者厚度在变化等等，但你仍然可以通过对密度积分得到质量。

youdao

Likewise, the availability of indicators for body mass index and skinfold thickness are particularly useful for monitoring the growing epidemic of childhood obesity.

同样，身体质量指数指标的可用性和皮肤褶厚度则特别有助于监测日益流行的儿童期肥胖。

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The mass is proportional to the length of the femur to the power three and to the thickness of the femur to the power two.

质量与股骨长度的,三次方成正比,同时与股骨厚度的平方,成正比。

youdao

The team found a link between body mass, skin thickness and how a child was born.

BBC: C-section 'may double risk of childhood obesity'

The most visible change is seen in the mountain glaciers, with loss of part of their mass due to decreasing thickness and a substantial recession in the last 100 years.

UNESCO: Dublin Core

Although the trial has several limitations, children in the low sugar group scored significantly lower across multiple measures of obesity, including BMI, weight, skinfold-thickness measurements, waist-to-height ratio, and fat mass.

FORBES: The Fat Lady's Soda Song: Sugary Beverages Cause Obesity